"rigorous" meaning in English

{
  "categories": [
    {
      "kind": "other",
      "name": "Terms suffixed with -ous",
      "parents": [],
      "source": "w"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "rigor",
        "2": "ous"
      },
      "expansion": "rigor + -ous",
      "name": "ety-suffix"
    }
  ],
  "etymology_text": "rigor + -ous",
  "forms": [
    {
      "form": "rigorous",
      "tags": [
        "positive"
      ]
    },
    {
      "form": "–",
      "tags": [
        "comparative"
      ]
    },
    {
      "form": "–",
      "tags": [
        "superlative"
      ]
    }
  ],
  "head_templates": [
    {
      "expansion": "[POS TABLE]",
      "name": "adj"
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  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "examples": [
        {
          "text": "To make herself fit, she kept to a rigorous program of exercise."
        }
      ],
      "glosses": [
        "To be rigorous someone needs to be very strict, exact and not change the rules."
      ],
      "id": "simple-rigorous-en-adj-xtTCSW1x"
    },
    {
      "examples": [
        {
          "text": "He found the walk through the snow was quite rigorous."
        }
      ],
      "glosses": [
        "Something that is rigorous is very difficult and unpleasant."
      ],
      "id": "simple-rigorous-en-adj--kt8M-xK"
    }
  ],
  "sounds": [
    {
      "ipa": "/ˈrɪɡərəs/"
    },
    {
      "audio": "en-us-rigorous.ogg",
      "tags": [
        "US"
      ]
    }
  ],
  "word": "rigorous"
}

{
  "categories": [
    "Terms suffixed with -ous"
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "rigor",
        "2": "ous"
      },
      "expansion": "rigor + -ous",
      "name": "ety-suffix"
    }
  ],
  "etymology_text": "rigor + -ous",
  "forms": [
    {
      "form": "rigorous",
      "tags": [
        "positive"
      ]
    },
    {
      "form": "–",
      "tags": [
        "comparative"
      ]
    },
    {
      "form": "–",
      "tags": [
        "superlative"
      ]
    }
  ],
  "head_templates": [
    {
      "expansion": "[POS TABLE]",
      "name": "adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "examples": [
        {
          "text": "To make herself fit, she kept to a rigorous program of exercise."
        }
      ],
      "glosses": [
        "To be rigorous someone needs to be very strict, exact and not change the rules."
      ]
    },
    {
      "examples": [
        {
          "text": "He found the walk through the snow was quite rigorous."
        }
      ],
      "glosses": [
        "Something that is rigorous is very difficult and unpleasant."
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˈrɪɡərəs/"
    },
    {
      "audio": "en-us-rigorous.ogg",
      "tags": [
        "US"
      ]
    }
  ],
  "word": "rigorous"
}